Wrench.



W. H. COOK.

WRENCH.

APPLIUATION FILED MAR. so, 1912.

1,072,090. Patented Sept. 2, 1913.

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WALTER HERBERT COOK, OE LONDON, ENGLAND.

WRENCH.

Specification of Letters Patent.

Patented Sept. 2,1913.

Application filed March 30, 1912. Serial No. 687,482.

To all 'whom t may concern Be it known that I, WALTER I'Innnnn'r Cook, a subject of the King of England, and residing at 115 Newgate street, London, England, have invented certain new and useful Improvements in Wrenches, of which the following is a Specification.

This invention relates to spanners or ad justable wrenches and has for object a wrench which will fit a number of nuts of different sizes.

The improved Spanner is of the type in which a fixed jaw is aorded by a spur or extension from the shank and a movable jaw is pivoted on the fixed jaw, a spring serving to hold this movable jaw normally away from the shank so as to close the two jaws together, while the motion of the shank to turn the nut closes the jaws together until the nut is gripped. When moving in the reverse direction the Spanner slips or ratchets over the nut, the jaws being opened against the action of the spring.

The essential features of the present invent-ion are the plurality of faces to the fixed jaw and the provision of a spring of U-shape, the U-spring being anchored in position in a special seating in the corner of a horn extending from the shank and making sliding contact With a curved surface on the interior of the movable jaw. Though anchored at one or more extremities, the spring is preferably a floating spring, the other extremities or extremity being free to move.

In the accompanying drawings, Figure 1 is a perspective View of the wrench with the jaws in the widest position. one of the coverplates being removed. Fig. 2 is a similar View with the jaws in the narrowest position. Fig. 3 is a view of the movable jaw detached. Fig. 4 is a View of the head of the shank. Fig. 5 shows on a smaller scale the wrench engaging a large-size nut. Fig. 6 shows the wrench engaging a small-size nut. Fig. 7 shows the wrench ready to engage a large-size nut. Fig. 8 shows the wrench ready to engage an intermediatesize nut. Fig. 9 shows the wrench ready to engage a Small-size nut.

The shank a may be of any desired shape and is preferably double-ended; each extremity is forked (see Fig. L1) and is provided with a spur b and a curved horn c. The spur b is thickened at its end to form the fixed jaw b* of the Spanner, presenting a plate f is j l so as to jaw b* of the spur b. The cover-plate is perforated plurality of faces b angle to one another; extreme faces is shown as angle may be varied.

The spur b has a hole el to receive a pivot d such as a screw or rivet, on which is mounted at (Z2 the movable jaw e. A cover also mounted at CZ upon the pivot be flush with the thickened end or b2 b3 arranged at an the angle between the 150 but this at g g to receive studs L L up- Standing from t-he movable jaw; when secured, the cover-plate therefore is rigidly attached to the movable jaw. A second cover plate f may be secured upon the lower side of the movable jaw, as shown in Figs. 1, 2 and 3.

The portion of the shank a between the spur b and the horn c is hollowed out to form a recess a for the reception of a spring di which closes up to a U-shapc, its branches bearing respectively against the movable jawl c and against the face of the recess, in such a way as to tend to close the jaws Z) e together.

The movable jaw e is connected to the fixed jaw by means of the pivot Z and the plates f f', and is provided with faces e c2 es; these faces are set at suitable angles corresponding to the corners of a hexagonal or other nut and the eover-plates are similarly shaped. The movable jaw has also a curved surface e4 (Fig. 3) against which the outer surface of the horn 0 is arranged to abut.

'Ihe spring may be a laminated or single plate spring as shown in Figs. 1 and 2, or a coiled wire spring as shown in Figs. 7 8 and 9. In the former case the one branch el bears against the bottom face of the recess a while the other branch i moves between the extreme positions shown in Figs. 1 and 2. In the latter ease it will be observed that the two branched extremities of the spring being anchored at the points against which they bear, the remainder of the spring forming the rounded extremity of the U floats freely between its extreme positions as indicated in these gures.

In Figs. 1, 5 and 7 the faces e e2 e3 of the movable jaw together with one face on the fixed jaw Z)X are in a position to engage four sides of the largest hexagonal nut which is intended to be gripped by the Spanner, these faces bearing against the nut for the whole of their length, as seen in Fig. 5. 'When the smallest size nut is gripped, the face e and part of the face e2 together with one face of the fixed jaw bx, bear against the nut, as seen in Fig. 6. For intermediate sized nuts, greater lengths of the face e2 and different faces of the jaw 2)* engage the nut.

Having thus described my invention, what l I claim as such and desire to secure by Letters Patent is An improved spanner wrench having a shank provided with a fixed jaw, said jaw having a plurality of faces adapted to engage singly one side of a nut; a movable jaw pivoted upon said shank having a plurality of faces arranged in angular relation and adapted to engage other sides of said nut, the said jaws in a number of positions presenting parallel faces to engage opposite sides of the nut, and said shank having a transversely extending recess; and a foldable spring of substantially U-shape seated 4 in said' recess having an arm tol bearagainst the movable jaw said spring extending substantially at right angles to the shank'and being disposed substantially in the transverse plane of the pivot about which the movable jaw swings and having a second arm adapted to fulcrum against the shank to permit the bight of the spring to fold or change its position in the recess in response 'to varying positions of the movable jaw whereby the tension of the springr is main-v tained substantially uniform in the several positions in which the movable jawv is adjusted.

In testimony whereof I aiiix my signature in presence of two witnesses.

WALTER HERBERT COOK. Witnesses:

VICTOR F. FEENY, R. WEsTAooTT.

Copies of this patent may be obtained for ve cents each, by addressing' the Washington, D. C.

Commissioner of Patents, 

